Tell us whether you think Stan Wawrinka, Tomas Berdych, Viktor Troicki or Borna Coric can truly threaten Novak Djokovic in the Dubai Duty Free Tennis Championships.
Who is Novak Djokovic’s biggest threat in Dubai? – poll
Tell us which player at the Dubai Duty Free Tennis Championships men's tournament you think is Novak Djokovic's greatest threat.
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